Tickets for a rock concert are selling fast! Tim and his 2 friends decide to buy tickets, his dad loans him $20 as well for an early birthday present. How much did each ticket cost if Tim paid $145 for himself and his friends?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.